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68 lines
2.5 KiB
C++
68 lines
2.5 KiB
C++
/**
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* Copyright 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef SAMPLES_LATENCY_TUNING_CALLBACK_H
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#define SAMPLES_LATENCY_TUNING_CALLBACK_H
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#include <oboe/Oboe.h>
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#include <oboe/LatencyTuner.h>
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#include <TappableAudioSource.h>
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#include <DefaultDataCallback.h>
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#include <trace.h>
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/**
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* This callback object extends the functionality of `DefaultDataCallback` by automatically
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* tuning the latency of the audio stream. @see onAudioReady for more details on this.
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*
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* It also demonstrates how to use tracing functions for logging inside the audio callback without
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* blocking.
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*/
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class LatencyTuningCallback: public DefaultDataCallback {
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public:
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LatencyTuningCallback() : DefaultDataCallback() {
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// Initialize the trace functions, this enables you to output trace statements without
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// blocking. See https://developer.android.com/studio/profile/systrace-commandline.html
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Trace::initialize();
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}
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/**
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* Every time the playback stream requires data this method will be called.
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*
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* @param audioStream the audio stream which is requesting data, this is the mPlayStream object
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* @param audioData an empty buffer into which we can write our audio data
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* @param numFrames the number of audio frames which are required
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* @return Either oboe::DataCallbackResult::Continue if the stream should continue requesting data
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* or oboe::DataCallbackResult::Stop if the stream should stop.
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*/
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oboe::DataCallbackResult onAudioReady(oboe::AudioStream *oboeStream, void *audioData, int32_t numFrames) override;
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void setBufferTuneEnabled(bool enabled) {mBufferTuneEnabled = enabled;}
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void useStream(std::shared_ptr<oboe::AudioStream> stream);
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private:
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bool mBufferTuneEnabled = true;
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// This will be used to automatically tune the buffer size of the stream, obtaining optimal latency
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std::unique_ptr<oboe::LatencyTuner> mLatencyTuner;
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oboe::AudioStream *mStream = nullptr;
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};
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#endif //SAMPLES_LATENCY_TUNING_CALLBACK_H
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